Improvement in hoisting apparatus



lE. G. OTIS. HOISTING APPARATUS.

N11-31,128. Patented Jan. 15, 1861.

fur ujn: Fryers co., wunuvcrcu, me

f .UNITED f-STATES- 4PATENT OFFICE.

ne. o'rilfo'r i'omr'nnsirnw YORK.

IMPROVEMENT iN HOISTING APPARATUS.

I Specification forming part-of Letters Paten-t No. 31,128, dated January 15, 1861.

To la/ZZ whom it. may concern: I'

Be it knownthat I, E. G. OTIs, of Yonkers, in the county of ivestchester and State of New- York, have invented a 'new and Improved Iloisting Apparatus; and I do hereby declare that the following is a full, clear, and exact f side view of the stop mechanism.'

Similar letters otieferencein'dicate correspondingparts in the several 'figur-es.

The object of this invention is to obtain a hoisting apparatus which may havcits weight or load stopped.A at any desired point and a brake automatically and simultaneously applied with the stoppingof the load or weight. The invention also has for its object the ksustaining of the load or weigh-t in case of the breaking of the lifting-rope in such a way as to insure a certain effectual action or operation ofthe load-sustaining mechanism.

To enable those skilled in the art r-o fully understand and construct'. 1n`yv invention, I

` will proceed to describe it.

A represents a base orV platl'orm, to which two uprights BB arc secured, said uprights having each a rack G at its inner side'. These racks C have teeth of hook form, or the teeth may be described as having an inclination upward, as shown clearly in- Fig. 2.

Between the uprigh'ts B B a platform l) is placed, the platform being secured to two ziprights a a, which are grooved vertically to receive the racks C C. .'loeach upright 0.abent lever E is attached by a fulcrum-pin 12,'

and the inner ends of the levers E E overlap each other and are fitted in an eye c at the lower end of avertical bar F, which passes loosely through a rail or bar (l, that connects the upper ends of the uprights a a. 'llo the lower end of the bar l1" a springe is attached,-

said spring having a tendency to keep the pawls f,which are attached to the lower ends of the levers E E, in gear with the racks C'C. This will be fully understood by lreferring to Fig. 2, in which it will be seenthatthe pawls f are connected to the ends of the levers E by' pivots, and have springs g attached, which springs have atcndency to keep the pawls pressedfdown into or between the teeth of the racks C. The pawls, it will -beseen, t or work in mortises hin the uprights aa. To

the upper end of the bar F there is a rope G v attached. This rope G passes over 4pulleys i t', and extending down is attached toa drum' II, which is connected bygearing. j k. to a shaft I, having two idle-pulleys .I K upon .it and a workin g-pulleyL between them.

lThe drum l-I and shaft' I have their bearings `attaehed to suitable uprights M M, and between these uprights there is vplaced a. drum N, around vwhich and thc ,idle-.pulleys .I K .belts Q P pass, one ofwhich P is across-belt. To the drum Il a rope Q is attached. This rope winds on druml-l lin ,a contrary 'direc-J tiento t xe rope @which is `com'nar'zted with the plattorm I). 'lhe rope Q passes upward over a pulley l and has a weight R attached to it,said weight serving asa cou'nterpoisefor the platform D.

The belts 0 'P pass through eyes m, attached tothe 'slide S, which forms a belt-ship-4 per. A This slide' is fitted in suitable guides'fn nl and has a 4rack o at one end, Vinto which a pinion p gears.- 'llhepinion p isona'shaft (l, which'l has a druln r placed on it, around which aro'pc 'l' passes, said rope being sccured tothe drum r and wound around. it in opposite directions. 'lhe rope 'l also passes over pulleys s s anddown "around a pulley t near the base A To the portion of the .rope

'l between the pulleys s s and a ropeU is n attached by abranched end V, each part uof which isattached to a side of' the ropeJl, as shownclearly in Fig. l l

To the slide or belt-shipper S there is attached an arm XV, the lower end`of which is attached by a pivot to abar X. 'lhis barX is attached bya pivotv to one of thcuprights M, and the bar X is provided with a pendent projection 1r, which bears on a barwY, one

en'd of which is attached by a'pivot toene of the nprights M and the oppositeend fittedina guide a. on oncotI the uprights. 'lo the bar Yat about its center a shoe Z is attached, which, when the bar Yis pressed downward, bears upon the working-pulley L.

'lhe operation, which will be readily seen,

is asfollows: fhen the drum N'is turned in the direction of the arrow and the belt P on 'the working-pulley Ll,

wound v011' the drum l and the plat-form l).-

the rope G will bc is impossible.

Aattached to the drum II instead of to the platl elevated, and in order to lower.` the platform the cross-belt P is moved on the' workingpulley L, the beltO being moved on the idlepulley J.' The shifting of these belts is effected by actuating the rope T by hand, the movement of which turns thedrum'rso that the ,pinion p will, in consequence of gearing into the racko, move the slide S. The rope U forms the stop, and when pulled down both parts uu of the branched end V of the rope U have 1their upper ends brought in the same horizont'al plane, and the slide S will be so actulated that the belt O. will b e on theidle-pulley J and beltP on the idle-pulley K, the shoe Z 1 being at the same time pressed down on the working-pulley L and serving as abrake. The

vbranched end `V of the rope U,it will be seen, .actuates the rope T when the machine is in operation, but will have no effect on said rope when the brake is applied, as the upper ends of both parts 11, u of the end V will be in a horizontal line with each other. In order to raise the platform D, the rope '.l is moved by hand seas to throw the belt O on the working-pulleyL, the shoe Z being simultaneously raised, and in orderto reverse the movement of the platform D and allow it to descend, the

1 rope T is moved so as to shift the cross-belt P on the working-pulley L.

Incase the rope G should breakin hoistin the loaded platform D, the pawls ff, in conse- -qu-ence of being released from the pull of said rope, will immediately be thrown in co'nnection with the racks U C by the springs e g g,

` ,and 'in consequence of the teeth of the racks being of hook form or pointed upward the pawls f f, under the weight of the load on the platform, will have a tendency to draw the uprights B B toward each other instead of forc ing them apart, and the pawls lock themselves with the racks, so that casual disengagement By having the counterpoise R form D the platform or load-sustaining mechanism is not at all interfered with, as would be the cas were' the rope Q attached directly tothe cross-piece d. To one of the nprights,

a anarm a* is attached, said arnr having an eye at its outer end, through .which the rope T passes, and said rope has a knot or projec- .I tion bx on it., against which lthe arm ax acts when the platform reaches its-lowest point of descent, and thereby throws the belt O off the working-pulley L and stops the descent of the' platform, while the bra-ke Z is simultaneously applied. t

Having thus describedmyinvention, what I claim as new, and desire to secure by Letters Patent.. is n 1. Having thefpawls f f and the teeth of the racks C C hook'formed,'essentialiy 'as shown,

shifting of the belts O P on the idle-pulleys J K, as set forth.

4. Attaching the rope Q of the eounterpoise R to the drum 1I on the opposite 'side from the lifting-rope G, substantially as shown, so as to counterpoise the platform D without preventing or interfering with the action of the safety mechanism E ef.

E. G. o'ms".

W it'nesses:

M. M. LIVINGSTON,

G. H. REED. 

